Percentage of the total cost to build-out leased facility received from the lessor.

No definition available.

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Balance Type:	na
Period Type:	instant

- Definition

Additional increase in the borrowing capacity when certain conditions are met, under a debt agreement on the amount that could be borrowed with a combination of, but not limited to, a line of credit and term loan.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Represents the percentage of the exit fee under the debt agreement.

+ References

No definition available.

+ Details

Name:	oxfd_DebtAgreementExitFeePercentage
Namespace Prefix:	oxfd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The final payment fee expressed as a percentage of the aggregate loan amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	oxfd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under a debt agreement on the amount that could be borrowed with a combination of, but not limited to, a line of credit and term loan.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under a debt agreement on the amount that could be borrowed with a combination of, but not limited to, a line of credit and term loan. Including additional increases to both when certain conditions are met.

+ References

No definition available.

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- Definition

Represents the term of the required periodic payments applied to interest.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
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- Definition

Represents the term of the required periodic payments applied to interest with the ability to extend the duration subject to certain conditions.

+ References

No definition available.

+ Details

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Namespace Prefix:	oxfd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The fee for early termination for the first year expressed as a percentage of commitment amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	oxfd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The fee for early termination for the second year expressed as a percentage of commitment amount.

+ References

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The fee for early termination for the third year and thereafter expressed as a percentage of commitment amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	oxfd_
Data Type:	num:percentItemType
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Period Type:	duration

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
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- Definition

This item represents the deferred credit for an incentive or inducement received by a lessee from a lessor, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental expense over the lease term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Lease Incentive
-URI http://asc.fasb.org/extlink&oid=6516590

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 55
-Paragraph 3
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-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.9)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying value as of the balance sheet date of portion of long-term loans payable due within one year or the operating cycle if longer.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

+ Details

Name:	us-gaap_LongTermLoansPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=oxfd_MidCapAgreementMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=oxfd_MidCapFinancialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=oxfd_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Note 8 - Loans Payable (Details Textual)		12 Months Ended
Note 8 - Loans Payable (Details Textual)	Oct. 04, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2013 USD ($) a
Cost to Build Facility, Percentage				80.00%
Loans Payable, Current		$ 84,000	$ 79,000
Loans Payable, Noncurrent		29,601,000	$ 386,000
MidCap Agreement [Member] \| MidCap Financial [Member]
Debt Agreement, Maximum Borrowing Capacity	$ 40,000,000
Long-term Debt		30,000,000
Debt Agreement, Additional Increase	10
Debt Agreement, Maximum Borrowing Capacity, Including Additional Increase	$ 60,000,000
Debt Agreement, Final Commitment Fee Percentage	6.00%
MidCap Agreement [Member] \| MidCap Financial [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 10,000,000
Line of Credit Facility, Expiration Period	5 years
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%
Line of Credit Facility, Early Termination, Commitment Fee Percentage, First Year	3.00%
Line of Credit Facility, Early Termination, Commitment Fee Percentage, Second Year	2.00%
Line of Credit Facility, Early Termination, Commitment Fee Percentage, Third Year and Thereafter	1.00%
Long-term Line of Credit		0
MidCap Agreement [Member] \| MidCap Financial [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate	4.45%
MidCap Agreement [Member] \| MidCap Financial [Member] \| Term Loan [Member]
Long-term Debt		$ 30,000,000
Debt Instrument, Term	5 years
Debt Instrument, Periodic Payment, Term	2 years
Debt Instrument, Periodic Payment, Term, Potential Extension	4 years
Debt Agreement, Exit Fee, Percentage		6.00%
Interest Expense		$ 1,800,000
MidCap Agreement [Member] \| MidCap Financial [Member] \| Term Loan [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	7.60%
Lease Incentive [Member]
Loans Payable, Current		71,000
Loans Payable, Noncurrent		$ 236,000
Marlborough, Massachusetts [Member]
Area of Real Estate Property \| a				14,500
Incentive from Lessor				$ 582,000